my laptop keyboard button pressing

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My laptop's keyboard is not working properly; some keys never work and some keys will keep on pressing and one key print character in the screen 77777777777777777777777777777777 etc. My computer is HP pavilion. I am tring to disable inteal keyboard.For this, I have uninstalled Device maneger->standard ps/2 driver.But after restarting computer driver autometically install driver in the system.Can i solve this problem .Please help because i am out of coding world !!!!!!!!!!!!!!!

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